3v4l.org

run code in 300+ PHP versions simultaneously
<?php $string = "pub-1885335825402893"; echo preg_replace('~(?:\G(?!^)|^pub-\d{5}(?=\d*$))\K\d(?=\d{5})~', '*', $string);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/Wmkt7
function name:  (null)
number of ops:  8
compiled vars:  !0 = $string
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, 'pub-1885335825402893'
    4     1        INIT_FCALL                                               'preg_replace'
          2        SEND_VAL                                                 '%7E%28%3F%3A%5CG%28%3F%21%5E%29%7C%5Epub-%5Cd%7B5%7D%28%3F%3D%5Cd%2A%24%29%29%5CK%5Cd%28%3F%3D%5Cd%7B5%7D%29%7E'
          3        SEND_VAL                                                 '%2A'
          4        SEND_VAR                                                 !0
          5        DO_ICALL                                         $2      
          6        ECHO                                                     $2
          7      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


preferences:
164.41 ms | 1008 KiB | 14 Q